A train collision in northern Iran killed at least 45 people and injured 100 on Friday, Iran's state media reported. The official IRNA news agency reported that the accident occurred in sub-zero temperatures when a moving passenger train struck another parked at Haftkhan station, about 150 miles east of the capital, Tehran. The report said that in the collision, four carriages derailed and two caught fire. Iran's judiciary says three employees of the state railroad company have been detained over the accident, the AP reports. (More Iran stories.)